The Patek Philippe Beta-21 Reference 3587/2G is a historically significant timepiece, representing a transitional period in watchmaking when traditional mechanical movements were giving way to innovative electronic quartz technology. Introduced in the early 1970s, this watch features an unconventional cushion-shaped 18k white gold case What sets it apart is its movement, the Beta-21, which was a collaborative effort among several Swiss watchmakers to embrace the emerging quartz technology. While the Beta-21 movement was highly accurate, it was relatively large, leading to the distinctive cushion-shaped case. The Reference 3587/2G, though emblematic of its era, stands as a testament to Patek Philippe's willingness to explore new horological frontiers and adapt to the changing landscape of watchmaking.